An algal bloom which has closed the commercial mussel industry has also affected the scallop fishery on Tasmania's east-coast.

The bloom is producing a shellfish toxin which forced the closure of several mussel processors earlier this month.

Bob Lister from the Scallop Fishermen's Association says it was detected in routine testing on November 2 and the industry voluntarily stopped fishing while there were further tests.

Those tests confirmed the presence of a toxin and the fishery has been closed until further notice as a precaution.

Mr Lister says there was no need for a recall because there has been no fishing.

"We're not permitted now to harvest or process scallops from the east coast area and, in fact, we haven't been permitted to do that since the 3rd of November when we had a voluntary precautionary measure closure," he said.

"There's about eight or 10 boats involved and about six processors.

"Once the level of algal reduces to acceptable levels we will approach the Department of Health about being able to re-open the scallop fishery."

The Bass Strait scallop fishery is not affected.

Mr Lister says there have been no reports of illness and the industry is committed to providing a safe product.

"This means that all Tasmanian scallops currently available for sale through retail outlets in thawed or frozen form are safe for human consumption or may have been supplied fresh from the unaffected Bass Strait Central Zone scallop fishery."

Routine testing of mussels from Spring Bay Seafoods earlier this month uncovered a type of naturally occurring algal bloom and sparked a worldwide recall of its product.